.ON APRIL 2ND a gizmo resembling a snowfall equipment on the deck of the USS Hornet, an obsolete aircraft-carrier anchored in San Francisco Gulf, began generating a moisture of salty aerosol fragments. The medical collaboration responsible for the job, the Marine Cloud Brightening (MCB) program, led by the Educational institution of Washington, is checking out whether such sprays might aid to slow weather modification by means of a type of "geoengineering". What performs this phrase way-- as well as why is it thus debatable?